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FSF Diatomaceous Earth from AniMed is a fine powder feed additive containing 100% pure food grade, fresh water ground Diatomaceous Earth. Safe for all mammals (warm blooded animals). Formed in nature centuries ago, Diatomaceous Earth is a natural source of amorphous silica, a trace mineral. Directions: As an anti-caking feed additive not to exceed 2% of feed ration. Important note: Use a dust mask when working with large quantities of Diatomaceous Earth.